A Manual of Underground Surveying |
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Common terms and phrases
accuracy accurate adit adjustment alidade altitude assay azimuth backsight bearing blue-print bore-holes calculated circle coal colliery collimation convenient coördinates correct course cross wires cross-hair declination determined distance drawing drift driven eccentricity elevation engineer equation error eyepiece feet floor geological graduated hole horizontal angles horizontal axis hour angle ibid inches inclined shaft instrument intersection latitude length line of sight lode logarithmic main telescope map or plan marked means measured meridian method Mineral mines minutes of arc nail necessary notes observation ordinary paper plane plate platted plumb-bob plumb-line Polaris position practical protractor sample scale screws sheet shellac side telescope sketch solar spads station stope stope-books string surface survey surveyor taken tangent tape theodolite timber tion top telescope traverse triangle tunnel underground vein vernier vertical angle vertical axis vertical shaft zero
Popular passages
Page 67 - When the solar compass is accurately adjusted, and its plates made perfectly horizontal, the latitude of the place, and the declination of the sun for the given day and hour, being also set off on...
Page 90 - Be it enacted by the Senate and House of Representatives of the United States of America in Congress assembled, That section 5352 of the Revised Statutes of the United States be, and the...
Page 136 - The owner or agent of every coal mine shall make or cause to be made an accurate map or plan of the workings of such coal mine, on a scale of one hundred feet to the inch.
Page 91 - Where patents have issued for mineral lands, those lands only shall be segregated and shall be deemed to be patented which are bounded by the lines actually marked, defined, and established upon the ground by the monuments of the official survey upon which the patent grant is based, and surveyors general in executing subsequent patent surveys, whether upon surveyed or unsurveyed lands, shall be governed accordingly.
Page 141 - ... of all parts of such mine, and the results of the same shall be duly extended on all maps of the mine and copies thereof, so as to show all excavations and the most advanced workings of the mine, and their exact relation to the boundary or section lines on the surface.
Page 140 - It shall be obligatory on the owners of adjoining coal properties to leave, or cause to be left, a pillar of coal in each seam or vein of coal worked by them along the line of adjoining property of such width that, taken in connection with the pillar to be left by the adjoining property owner, will be a sufficient barrier for the safety of the employes of either mine in case the other should be abandoned and allowed to fill with water...
Page 136 - ... date of each survey on the gangways or the most advanced workings. It shall also accurately show the boundary lines of the lands of the said coal mine or colliery and the proximity of the workings thereto, and in case any mine contains any water dammed up in any part thereof, it shall be the duty of the owner, operator or superintendent to cause the true location of the said dam to be accurately marked on said map or plan, together with the 'tidal elevation, inclination of strata and area of...
Page 166 - In another type of electrical machine several horizontal rollers are provided, with the light so arranged that as the tracing and blue-print paper passes from one roller to another the exposure is made. The speed of the machine is controllable and the length of the tracing that can be printed is limited only by the length of the roll of blue-print paper. With this machine, then, long plans or profiles can be printed without the necessity of frequent splicing which is required with other types of...
Page 139 - Pleas of the county in which such colliery is situated, for an order to have an accurate map or plan of said colliery prepared, and if such survey shall prove that the map furnished was materially inaccurate or imperfect, such owner, operator, or superintendent shall be liable for the expense incurred in making the same.
Page 23 - To make the Line of Sight perpendicular to the Horizontal Axis of the Telescope.* — When this is done, the line of sight will generate a plane when the telescope is revolved on its horizontal axis.